coa.5: refactor char display into guarded helpers; fix missed sites; restore login scan

- Extract AddCharacterTooltipHeader() + SetCharacterRowNameLevel() (Altoholic.lua);
  nil-guards centralized, callers in AccountSummary/Activity/BagUsage/Skills/tooltip.
- Fix sites the manual sweep missed: Skills.lua (row + skill ranks), Keys.lua x3,
  ShowClassIcons sort (Altoholic.lua:705, getters bypass their own or-0 via the wrapper).
- Restore login scan: OnPlayerAlive was ghost-only (fdcb25a) so iLvl never populated;
  now scans once per session. Removed dated DEBUG leftovers.

DataStore_Inventory/DataStore_Inventory.lua

@@ -167,10 +167,13 @@ function ScanInventory()
 end
 
 -- *** Event Handlers ***
+local hasScannedThisSession
 local function OnPlayerAlive()
-	-- print("DataStore_Inventory.lua") -- DEBUG 2025 07 21
-	if not UnitIsGhost("player") then return end -- only scan if player released spirit and went to graveyard
-	
+	-- CoA: scan once at login. PLAYER_ALIVE also fires on resurrect / Feign-Death cancel where gear
+	-- is unchanged, so skip those. (The previous "only when ghost" gate also skipped login, so iLvl
+	-- never populated and UNIT_INVENTORY_CHANGED was the only scan path - see commit fdcb25a.)
+	if hasScannedThisSession then return end
+	hasScannedThisSession = true
 	ScanInventory()
 end